path_id: add iscsi support

[elogind.git] / extras / path_id / path_id.c

diff --git a/extras/path_id/path_id.c b/extras/path_id/path_id.c
index 379334f02f60693dbe0abef446dc6e8718ce341c..b0a0bfd885e0101f95ee91cef2de8cb94697b9ab 100644 (file)
--- a/extras/path_id/path_id.c
+++ b/extras/path_id/path_id.c
@@ -137,28 +137,18 @@ out:
 static struct udev_device *handle_fc(struct udev_device *parent, char **path)
 {
        struct udev *udev  = udev_device_get_udev(parent);
-       struct udev_device *targetdev = NULL;
-       char *syspath = NULL;
-       struct udev_device *fcdev;
+       struct udev_device *targetdev;
+       struct udev_device *fcdev = NULL;
        const char *port;
        unsigned int lun;
 
        targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
-       if (targetdev == NULL) {
-               parent = NULL;
-               goto out;
-       }
-
-       if (asprintf(&syspath, "%s/fc_transport/%s", udev_device_get_syspath(targetdev), udev_device_get_sysname(targetdev)) < 0) {
-               parent = NULL;
-               goto out;
-       }
-       fcdev = udev_device_new_from_syspath(udev, syspath);
-       if (fcdev == NULL) {
-               parent = NULL;
-               goto out;
-       }
+       if (targetdev == NULL)
+               return NULL;
 
+       fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
+       if (fcdev == NULL)
+               return NULL;
        port = udev_device_get_sysattr_value(fcdev, "port_name");
        if (port == NULL) {
                parent = NULL;
@@ -168,20 +158,69 @@ static struct udev_device *handle_fc(struct udev_device *parent, char **path)
        lun = strtoul(udev_device_get_sysnum(parent), NULL, 10);
        path_prepend(path, "fc-%s:0x%04x%04x00000000", port, lun & 0xffff, (lun >> 16) & 0xffff);
 out:
-       free(syspath);
        udev_device_unref(fcdev);
        return parent;
 }
 
 static struct udev_device *handle_sas(struct udev_device *parent, char **path)
 {
-       path_prepend(path, "sas-PATH_ID_NOT_IMPLEMENTED");
-       return parent;
+       return NULL;
 }
 
 static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
 {
-       path_prepend(path, "ip-PATH_ID_NOT_IMPLEMENTED");
+       struct udev *udev  = udev_device_get_udev(parent);
+       struct udev_device *transportdev;
+       struct udev_device *sessiondev = NULL;
+       const char *target;
+       char *connname;
+       struct udev_device *conndev = NULL;
+       const char *addr;
+       const char *port;
+
+       /* find iscsi session */        
+       transportdev = parent;
+       while (1) {
+               transportdev = udev_device_get_parent(transportdev);
+               if (transportdev == NULL)
+                       return NULL;
+               if (strncmp(udev_device_get_sysname(transportdev), "session", 7) == 0)
+                       break;
+       }
+       if (transportdev == NULL)
+               return NULL;
+
+       /* find iscsi session device */
+       sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
+       if (sessiondev == NULL)
+               return NULL;
+       target = udev_device_get_sysattr_value(sessiondev, "targetname");
+       if (target == NULL) {
+               parent = NULL;
+               goto out;
+       }
+
+       if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) {
+               parent = NULL;
+               goto out;
+       }
+       conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
+       free(connname);
+       if (conndev == NULL) {
+               parent = NULL;
+               goto out;
+       }
+       addr = udev_device_get_sysattr_value(conndev, "persistent_address");
+       port = udev_device_get_sysattr_value(conndev, "persistent_port");
+       if (addr == NULL || port == NULL) {
+               parent = NULL;
+               goto out;
+       }
+
+       path_prepend(path, "ip-%s:%s-iscsi-%s-lun-%s", addr, port, target, udev_device_get_sysnum(parent));
+out:
+       udev_device_unref(sessiondev);
+       udev_device_unref(conndev);
        return parent;
 }
 
@@ -228,6 +267,7 @@ static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **pa
                goto out;
        }
 
+       /* broken scsi transport devices would need a subsystem */
        name = udev_device_get_syspath(parent);
 
        /* fibre channel */
@@ -288,8 +328,7 @@ static struct udev_device *handle_usb(struct udev_device *parent, char **path)
 
 static struct udev_device *handle_cciss(struct udev_device *parent, char **path)
 {
-       path_prepend(path, "cciss-PATH_ID_NOT_IMPLEMENTED");
-       return parent;
+       return NULL;
 }
 
 static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)